Grade 12th passAlgebra
the sum of n terms of an A.P. is 3n2 +5. the number of term which equals 159 is????
the sum of n terms of an A.P. is 3n2 +5. the number of term which equals 159 is????
1 Answer
aarthi s
Approved Tutor Answer11 Years agoTn=Sn-(Sn-1)
Tn=159
Sn=3n^2+5
Sn-1=3(n-1)^2+5
substitute these values and you get 27
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